Al-Zn-Mg-Cu合金多結晶におけるHall-Petch関係と強化機構

概要

論文の詳細を見る
7475 type Al-Zn-Mg-Cu alloy polycrystals which consist of the average grain sizes ranging from 27 to 283 μm were prepared by solution treating at 753 K and aging at 393 K for various times. Tensile tests and micro hardness tests for these specimens were performed to evaluate both the Hall-Petch relation and three kinds of strengthening mechanisms. Correlation between the flow stress or Vickers hardness and the inverse square root of the average grain size are all represented by straight lines. The Hall-Petch slopes are nearly independent of the strain quantities and aging times, but the friction stresses increase with those increments. The contributions of grain refining effect, solid solution and precipitation strengthening to the 0.2% proof stress of the aged specimens for 86.4 ks are estimated to be 5, 82 and 310 MPa, respectively. Moreover, the rate-controlling mechanisms of yield behavior in the precipitation strengthening are made clear by comparing the experimental values with the theoretical ones.
一般社団法人日本機械学会の論文
2002-07-25